The Diurnali del duca di Monteleone is an anonymous annals of the Kingdom of Naples for the years 1265–1458.
The work was initially entitled Cronaca or Storia d'incerto autore ('history of an uncertain author') by Angelo di Costanzo in the 16th century.
The title by which it is now known comes from a manuscript owned by Ettore III Pignatelli, Duke of Monteleone.
Its sources include the Breve chronicon of Guglielmo Marramaldo, the Annales of Tommaso Loffredo and the Diarium regum Neapolis et Siciliae.
Its style is lively, imitative of the cantari [it] (popular songs), and it makes extensive use of direct speech.